Self-locking drive-gear.



F. HENDLER.

SELF LOCKING DRIVE GEAR.

APPLIOA'LION FILED MAR. 9, 190a.

Patented May, 18, 1909. 3 6 6 1 5g. 2. 63

SflENT OFFICE.

FRIEDRICH HENDLER, OF ESSEN-ON-THE-RUHR, GERMANY, ASSIGNOR TO FRIED.KRUPP AKTIENGESELLSCHAFT, OF ESSEN-ON-THE-RUHR, GERMANY.

SELF-LOCKING DRIVE-GEAR.

T 0 all whom it may concern:

Be it known that I, FRIEDRICH HENDLER, a subject of the Emperor ofGermany, and a resident of Essen-on-the-Ruhr, Germany, have inventedcertain new and useful Improvements in Self-Locking Drive-Gears, ofwhich the following is a specification.

This invention relates to drive-gears provided with automaticdouble-acting locking devices for the driven member, which lookingdevices are released by the act of applying power through the drivingmember.

According to the present invention, the securing or locking meanscomprises a bolt clutch with a large number of bolts and with seatsdifferent in number from the bolts.

In the accompanying drawings, which show one embodiment of the inventionby way of illustration, Figure 1 is an axial longitudinal section of thedrive-gear with engaged locking device; Fig. 2 is a view corres ondingto Fig. 1, with disengaged locking d evice; Figs. 3 and 4 are sectionstaken respectively on the lines 3*3 and 44 of Fig. 1, seen from theleft; Fig. 5 is a section on the line 55 of Fig. 1, seen from the left.

A is the driving shaft and B the driven shaft of the drive-gear. Theshaft B has bearing in an extension 0 from the base C of a cylindricalhousing C C 0 This housing is rigidly secured upon a frame D, throughthe medium of its extension 0 Mounted upon the shaft B is a disk B whichabuts against the inner face of the wall of the housing C C 0 so thatthe shaft B is secured against displacement. he shaft A is journaledco-axially with the shaft B, in a bore b of the shaft B and in the coverC of the housing 0 C C said shaft carries a cupshaped grip wheel E whichincloses a cylindrical wall 0 of the housing C C O and covers the coverC of the housing. The end of the shaft A which lies in the bore 6 abutsagainst the base of said bore and thus prevents the shaft A from beingdisplaced in one direction. The shoulder a (Figsi and 2) on the shaft A,for which a de ression is provided in the housing cover 8 secures theshaft A against displacement in the other direction.

In the disk B are rovided a number of bores 6 (see particu arly Fig. 3).In the particular design of drive-gear shown in the drawing, the numberof these bores is 22. The locus of the axes of these bores b is aSpecification of Letters Patent.

Application filed March 9, 1908.

Patented May 18, 1909.

Serial No. 419,989.

cylinder whose axis coincides with the axis of the shafts A B. Theseholes 6 are located at equal angular distances apart. In each bore b isslidably mounted a cylindrical bolt G (Figs. 1 to 4). Each of the boltsG is under the influence of a spring 9 arranged in a bore 9* of the boltand abutting at one end against the base of said bore and at the otherend against the housing cover C The springs g consequently tend to pressthe bolts away from the base of the housing C. The latter is providedwith a plurality of bores 0 (Figs. 1, 2 and 4), the locus of whose axesis in the same cylinder as that of the axes of the bore b of the disk Bor the axes of the bolts G. The bores 0 can serve as seats for the boltsG, their diameters being slightly greater than the diameters of thebolts G. The number of seats c in the particular design of drive-gearillustrated in the drawing, is 23. The distance between the seats 0 isuniform.

From the foregoing explanation of the number and arrangement of thebolts G and the seats c it follows that the distance between tWoadjacent bolts is slightly greater than the distance between the tWoadjacent seats. From this, and the fact that the diameter of the seats 0is slightly larger than the diameter of the bolts G, it follows that atevery angular position which the disk B may assume relatively to thehousing C C G at least one of the bolts G can enter under the influenceof its spring 9 into engagement with one of the seats a. The proportionshere presented are like the Vernier scale, the spacing of whose slidescale graduations are to a certain degree greater or less than thespacing of the graduations of the main scale. In the further explanationof the operation of the drive-gear it is assumed that the diameter ofthe seats 0* is so determined that for each angular position of the disk13, only one of the bolts G can ever enter into a seat o In theenlargement b (Fig. 2) of the bore 12 in the sh aft B, for the shaft Aand in a central depression 12 of the disk B is journaled a box Fprovided with a flange F movable in an axial direction upon the shaft A.By the aid of this box, the bolts G can be disengaged from the seat a.For this purpose each bolt G carries a projection 9 (see also Fig. 3) onthat end which is toward the housing cover C which projection is guidedin a slot 1) of the disk B and engages in a recess f of the flange F Thebox F is non-rotatably connected with the disk B or shaft B, by twobolts J. These bolts are screwed into the disk B and engage in bores ofthe flange F.

In the shaft A, and transverse to its axis, is inserted a bolt K (Figs.1, 2 and 5) whose en'ds project beyond the shaft A and into twodiametrically opposite openings of the box F. The openings f areessentially in the form of an equilateral triangle whose base liestransverse to the axis of the shaft A. In the position of rest assumedby the block F in Fig. 1, the ends of the bolt K lie at the apex of theopening f Consequently, if the shaft A is rotated in either direction,the cooperation of the bolt K with one of the in clined walls f (Figs. 1and 2) of the openings f the box F will be displaced from its positionof rest to the position shown in Fig. 2. For return of the box F to itsposition of rest, a spiral spring L is employed which is confined undercompression between the flange F of the box and the housing cover 0".

In the position of rest the several parts of the drive-gear assume theposition shown in Fig; 1. The flange F of the box F lies at the base ofthe recess 6 One of the bolts G stands in engagement with a seat 0 sothat the shaft B is prevented from turning in either direction, the playwhich the bolt may have in the seat being too slight to permit anyperceptible turning of the shaft. The remaining bolts rest against theinter-rest spaces of the inner wall of the base C of the housing. If theshaft A is turned in either one direction or the other through themedium of the grip-wheel E, the box F will first be forced by thecooperation of bolt K with one of its walls f of the cpeningf into theposition shown in Fig. 2, thereby further compressing the spring L. Fromthe beginning of this displacement of the box F that one of the bolts Gwhich stands in engagement with the seat 0 will be picked up through itsprojection 0 by the flange F of the box F; that is to say, it will bewith drawn or disengaged from the seat 0. Toward the end of saidmovement of the box F, the remaining bolts will be moved, so that in theposition of the box shown in Fig. 2, none of the bolts will impingeagainst the inner wall of the base C of the housing. By thisdisplacement of the bolts G, their springs g will be compressed. Whenthe ends. of the bolt K reach the position in the openingsf of the box Fshown in Fig. 2, the box F will be icked up through the medium of thebolt K by the shaft A. Through the medium of the bolts J, the rotationof the box F is followed by the disk B and the latter is accompanied bythe turning of the shaft B. The bolts G are thus held in disengagedposition by means of the flange F of the box F. If the grip wheel E isreleased, the box F, under the influence of its spring L, returns to itsposition of rest (Fig. 1) so that the bolts G are left to the influenceof their springs and one of said bolts can enter into engagement withone of the seats c. As previously stated, such an engagement isracticable at every angular position which t e disk B can assumerelatively to the housing 0 (7 C By the movement of the box F into thisposition of rest, the ends of the bolt K again slide along one of thewalls f of the openings f so that the shaft A is turned backward to aslight degree. Consequently, the tension of the spring L must at leastbe sufficeint to overcome the friction due to the aforesaid movement ofthe box and the rotation of the shaft. Immediately after release of thegrip wheel E, and the entrance of one of the bolts G into engagementwith a seat 0, shaft B is again locked against rotation in eitherdirection.

The described drive-gear is distinguished from known arrangements ofthis kind employing a friction clutch for locking the driven member, bythe greater certainty of driving, also by the fact that its interlockingfaces are subjected to much less wear.

Having thus described the invention, the following is what I claim asnew therein, and desire to secure by Letters Patent:

1.. A drive-gear comprising driving and driven members and an automaticdouble acting and drive-released locking device for the driven memberthe locking device comprising a circular series of bolts, a memberhaving a similar series of cooperating seats into which the bolts tendto enter, an axially slidable bolt displacing member adapted to engagethe bolts to hold them out of engagement with the seats, and aconnection between the bolt-displacing member and the driving memberthrough which said bolt-displacing member is moved in the direction torelease the bolts from the seats when the driving member is turned ineither direction.

2. In a drive-gear having automatic looking means for the driven member,the combination of the driving and driven members, one of which isadapted to drive the other through means which permits lost motion between the driving and driven members, the bolts mounted in circularseries on the driven member, the fixed member having the series of seatsarranged concentrically with said bolts, said bolts tending to entersaid seats, and an axially-movable connection through which the saiddriving member holds the bolts out of engagement with the seats.

3. In a drive-gear, the combination with a fixed member provided with aseries of seats, of the driving and driven members having lost motionbetween them, a series of bolts mounted upon the driven member andadapted to move into and out of en 'agement with said seats, a membermovab e axially relatively to the driven member, the cam connectionbetween the driving member and the axially movable member through whichthe latter is moved by the driving member during the lost motion betweenthe driving and driven members, and means through which said axiallymovable member engages the bolts to hold them out of engagement with theseats.

4. In an automatic self-looking and drivereleased drive-gear, thecombination of the casing provided with a series of seats, the drivenmember provided with a series of bolts adapted to enter said seats, adisplacing box having driving connection with the driven member butaxially movable relatively thereto and adapted to engage the bolts forholding them out of engagement with the seats, and a driving memberhaving lost motion connection with the displacing box, eonstrueted toimpart the axial movement to the displacing box during said lest motion.

5. In a self-looking and drive released drive-gear, the combination ofthe casing provided with a plurality of seats, the driven member, a diskcarried by said driven me nber and fitted in said casing, a plurality ofbolts differing in number from the seats, said bolts being mounted inthe disk, and provided with sorings tending to force them into theseats, bolts carried by the driven member through which the drivingmotion is imparted to it, a displacing box movable axially relatively tothe driven member andhaving openings receiving the driving bolts throughwhich the driven member may be rotated by the disnlaoing box, a drivingmember having a lost motion connection with the displacing box,constructed to impart axial movement to said box during the lost motion,and a spring for returning the displacing box to its position of rest inwhich it releases the locking bolts.

6. In a self-looking drive-released drive gear, the combination of thecasing, construoted with a circular series of seats, a driven member, adisk carried by said driven member and rotatably fitted in said easing,a circular series of spring-pressed locking bolts carried by said diskand adapted to enter said'seats and constructed with projections throughwhich they may be moved in opposition to their springs, bolts throughwhich motion is transmitted to the driven member, an axially movabledisplacing box having openings which receive the transmitting boltsadapted to engage the projections on the looking bolts to hold them outof engagement with the seats, a driving member having a lost motiondriving and displacing connection with the displacing box, a cover forthe casing, and a spring interposed between the displacing box and thecasing cover.

The foregoing specification signed at Diisseldori Germany, this 19th dayof December, 1907.

FRIEDRICH HENDLER. In presence of VVILHELM FLAsoHE, CLEMENT HEoKMANNY.

